Index: src/wp-includes/js/mce-view.js
===================================================================
--- src/wp-includes/js/mce-view.js	(revision 29534)
+++ src/wp-includes/js/mce-view.js	(working copy)
@@ -156,8 +156,18 @@
 							'<html>' +
 								'<head>' +
 									'<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />' +
+									'<style>' +
+										'html, body {' +
+											'background: transparent;' +
+											'padding: 0;' +
+											'margin: 0;' +
+										'}' +
+										'body {' +
+											'padding: 1px 0;' +
+										'}' +
+									'</style>' +
 								'</head>' +
-								'<body data-context="iframe-sandbox" style="padding: 0; margin: 0;" class="' + editor.getBody().className + '">' +
+								'<body data-context="iframe-sandbox">' +
 									html +
 								'</body>' +
 							'</html>'
@@ -166,7 +176,7 @@
 
 						resize = function() {
 							// Make sure the iframe still exists.
-							iframe.contentWindow && $( iframe ).height( $( iframeDoc.body ).height() );
+							iframe.contentWindow && $( iframe ).height( $( iframeDoc.body ).outerHeight() );
 						};
 
 						if ( MutationObserver ) {
Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 29534)
+++ src/wp-includes/media.php	(working copy)
@@ -3310,18 +3310,9 @@
  */
 function wp_media_mce_styles() {
  	$version = 'ver=' . $GLOBALS['wp_version'];
- 	$tinymce = includes_url( "js/tinymce/skins/lightgray/content.min.css?$version" );
 	$dashicons = includes_url( "css/dashicons.css?$version" );
- 	$skin = includes_url( "js/tinymce/skins/wordpress/wp-content.css?$version" );
  	$mediaelement = includes_url( "js/mediaelement/mediaelementplayer.min.css?$version" );
  	$wpmediaelement = includes_url( "js/mediaelement/wp-mediaelement.css?$version" );
 
- 	$mce_styles = array( $tinymce, $dashicons, $skin, $mediaelement, $wpmediaelement );
- 	$editor_styles = get_editor_stylesheets();
-	if ( ! empty( $editor_styles ) ) {
-		foreach ( $editor_styles as $style ) {
-			$mce_styles[] = $style;
-		}
-	}
-	return $mce_styles;
-}
\ No newline at end of file
+	return array( $dashicons, $mediaelement, $wpmediaelement );
+}
